Historical on-time performance
Houston to Ontario
1,345 miData through Dec 2025Source: US DOT · BTS
Flights on HOU–ONT arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 305 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time84%Medianon timep9020 minCancel0.7%Flights305
Why flights run late
Delay causes
- Airline35%
- Weather7%
- Air traffic (NAS)12%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly HOU → ONT
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 91% on time.
- Mornings91% on time · p90 10 min · 314 flights
- Afternoons78% on time · p90 25 min · 125 flights · limited
- Evenings76% on time · p90 55 min · 71 flights · limited
- Middays72% on time · p90 45 min · 296 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 90% on time.
- Tuesdays90% on time · p90 10 min · 117 flights · limited
- Thursdays82% on time · p90 20 min · 114 flights · limited
- Wednesdays80% on time · p90 30 min · 117 flights · limited
- Mondays79% on time · p90 55 min · 118 flights · limited
- Saturdays78% on time · p90 25 min · 106 flights · limited
- Fridays78% on time · p90 35 min · 116 flights · limited
- Sundays76% on time · p90 45 min · 119 flights · limited
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